event.pressure

Overview

Number indicating the pressure of a touch, typically used to detect "3D Touch" events on compatible iOS devices (for instance the iPhone 6S). A value of 1.0 is the average touch pressure of the typical user. Knowing this, you can use a value 2-3 times higher to trigger special functionality.

Gotchas

This value will be nil if the device does not support pressure-sensitive touch.

This event property is technically supported on Android, however the values are completely inconsistent between different devices/manufacturers. Thus, attempting to implement varying degrees of touch pressure on Android is impractical.